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use std::{path::Path, fs};
use anyhow::{Result, Context};
use itertools::Itertools;
use rnix::{SyntaxKind, ast::{AttrpathValue, AttrSet, HasEntry, Entry::*}, SyntaxNode};
use rowan::{ast::AstNode, TextSize};
use crate::status_reporter::StatusReport;
fn textsize_at_line(s: &str, line: usize) -> TextSize {
s
.split('\n')
.map(|l|
TextSize::of(l) + TextSize::new(1)
)
.take(line-1)
.sum()
}
fn dig_to_kind(kind: SyntaxKind, node: &SyntaxNode) -> Option<SyntaxNode> {
if node.kind() == kind {
return Some(node.clone());
}
node.descendants()
.filter(|node| node.kind() == kind)
.next()
}
fn add_to_meta_block(rough_pos: SyntaxNode, content: &str, main_program: &str, file: &Path, line: usize) -> Result<(String, usize)> {
let meta_node = dig_to_kind(SyntaxKind::NODE_ATTR_SET, &rough_pos).unwrap();
let meta_set = AttrSet::cast(meta_node.clone()).unwrap();
let description_entry = meta_set.entries()
.filter(|entry| {
match &entry {
Inherit(it) => it.attrs().any(|c| c.to_string() == "description"),
AttrpathValue(it) => it.attrpath().unwrap().to_string() == "description",
}
})
.exactly_one().ok()
.with_context(|| format!("meta node has no description attribute in {:?} at {}", file, line))?;
let description = description_entry.syntax();
let pos = description.text_range();
let indent = content[..pos.start().into()].chars().rev().position(|c| c == '\n').unwrap();
let patch = String::new()
+ "\n"
+ &" ".repeat(indent)
+ "mainProgram = \"" + main_program + "\";";
Ok((patch, pos.end().into()))
}
fn edit_one(file: &Path, line: usize, main_program: &str, p: &StatusReport) -> Result<String> {
let mut content = fs::read_to_string(file)?;
let searchpos = textsize_at_line(&content, line);
p.update_item(format!("doing {:?}", file));
let parse = rnix::Root::parse(&content);
if !parse.errors().is_empty() {
anyhow::bail!("error: {:?}", parse.errors());
}
let tree = parse.tree();
let pos_node = tree.syntax().descendants()
.filter(|node| {
if node.kind() == SyntaxKind::NODE_ATTRPATH_VALUE {
let value = AttrpathValue::cast(node.clone()).unwrap();
node.text_range().contains(searchpos) && value.attrpath().unwrap().to_string() == "meta"
} else { false }
})
.exactly_one().ok();
// do we have a meta attrset already?
let (patch, insert_offset) = match pos_node {
None => {
let version_node = tree
.syntax()
.descendants()
.filter(|node| {
if node.kind() == SyntaxKind::NODE_ATTRPATH_VALUE {
let value = AttrpathValue::cast(node.clone()).unwrap();
let name = value.attrpath().unwrap().to_string();
node.text_range().contains(searchpos + TextSize::new(5))
&& (name == "version" || name == "pname" || name == "name")
} else { false }
})
.exactly_one().ok()
.with_context(|| format!("neither meta nor version node found for {:?} at {}", file, line))?;
let attrset = version_node.parent().unwrap();
if attrset.kind() != SyntaxKind::NODE_ATTR_SET {
anyhow::bail!("name not in an attrset in {:?} at {}", file, line)
}
// does a meta block already exist?
let maybe_meta_block = attrset
.descendants()
.filter(|node| {
if node.kind() == SyntaxKind::NODE_ATTRPATH_VALUE {
let value = AttrpathValue::cast(node.clone()).unwrap();
let name = value.attrpath().unwrap().to_string();
name == "meta"
} else { false }
})
.exactly_one();
if let Ok(meta) = maybe_meta_block {
add_to_meta_block(meta.clone(), &content, main_program, file, line)?
} else {
let before_attrset_end = Into::<usize>::into(attrset.text_range().end())
- 1
- content[..attrset.text_range().end().into()]
.chars().rev().position(|c| c == '\n').unwrap();
let indent = content[..version_node.text_range().start().into()]
.chars().rev().position(|c| c == '\n').unwrap();
// some language specific build systems don't use meta as its own attrset
// there's no good way to recognise these, but this seems to work fine
let weird_nonstandard_meta = attrset
.descendants()
.any(|node| {
if node.kind() == SyntaxKind::NODE_ATTRPATH_VALUE {
let value = AttrpathValue::cast(node.clone()).unwrap();
let name = value.attrpath().unwrap().to_string();
name == "description" || name == "homepage" || name == "license"
} else { false }
});
let patch = String::new()
+ "\n"
+ &" ".repeat(indent)
+ if weird_nonstandard_meta { "mainProgram = \"" } else { "meta.mainProgram = \"" }
+ main_program + "\";";
(patch, before_attrset_end)
}
},
Some(pos) => {
add_to_meta_block(pos.clone(), &content, main_program, file, line)?
}
};
content = String::new()
+ &content[..insert_offset]
+ &patch
+ &content[insert_offset..];
p.changed_item();
Ok(content)
}
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